Green/yellow solid state lighting via radiative and nonradiative energy transfer involving colloidal semiconductor nanocrystals

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buir.contributor.authorDemir, Hilmi Volkan
buir.contributor.orcidDemir, Hilmi Volkan|0000-0003-1793-112X
dc.citation.epage1170en_US
dc.citation.issueNumber4en_US
dc.citation.spage1163en_US
dc.citation.volumeNumber15en_US
dc.contributor.authorNizamoglu, S.en_US
dc.contributor.authorSari, E.en_US
dc.contributor.authorBaek, J. H.en_US
dc.contributor.authorLee, I. Hen_US
dc.contributor.authorDemir, Hilmi Volkanen_US
dc.date.accessioned2015-07-28T12:06:21Z
dc.date.available2015-07-28T12:06:21Z
dc.date.issued2009-08-05en_US
dc.departmentDepartment of Physicsen_US
dc.departmentDepartment of Electrical and Electronics Engineeringen_US
dc.departmentInstitute of Materials Science and Nanotechnology (UNAM)en_US
dc.departmentNanotechnology Research Center (NANOTAM)en_US
dc.description.abstractLEDs made of In(x)Ga(1-x)N and (Al(x)Ga(1-x))(1-y)In(y)P suffer from significantly reduced quantum efficiency and luminous efficiency in the green/yellow spectral ranges. To address these problems, we present the design, growth, fabrication, hybridization, and characterization of proof-of-concept green/yellow hybrid LEDs that utilize radiative and nonradiative [Forster resonance energy transfer (FRET)] energy transfers in their colloidal semiconductor nanocrystals (NCs) integrated on near-UV LEDs. In our first NC-LED, we realize a color-converted LED that incorporate green-emitting CdSe/ZnS core/shell NCs (lambda(PL) = 548 nm) on near-UV InGaN/GaN LEDs (lambda(EL) = 379 nm). In our second NC-LED, we implement a color-converted FRET-enhanced LED. For that, we hybridize a custom-design assembly of cyan-and green-emitting CdSe/ZnS core/shell NCs (lambda(PL) = 490 and 548 nm) on near-UV LEDs. Using a proper mixture of differently sized NCs, we obtain a quantum efficiency enhancement of 9% by recycling trapped excitons via FRET. With FRET-NC-LEDs, we show that it is possible to obtain a luminous efficacy of 425 lm/W(opt) and a luminous efficiency of 94 lm/W, using near-UV LEDs with a 40% external quantum efficiency. Finally, we investigate FRET-converted light-emitting structures that use nonradiative energy transfer directly from epitaxial quantum wells to colloidal NCs. These proof-of-concept demonstrations show that FRET-based NC-LEDs hold promise for efficient solid-state lighting in green/yellow.en_US
dc.description.provenanceMade available in DSpace on 2015-07-28T12:06:21Z (GMT). No. of bitstreams: 1 10.1109-JSTQE.2009.2015680.pdf: 734891 bytes, checksum: 810e392cf83bcb3881d8c561042f2c37 (MD5)en
dc.identifier.doi10.1109/JSTQE.2009.2015680en_US
dc.identifier.issn1077-260X
dc.identifier.urihttp://hdl.handle.net/11693/13443
dc.language.isoEnglishen_US
dc.publisherIEEEen_US
dc.relation.isversionofhttp://dx.doi.org/10.1109/JSTQE.2009.2015680en_US
dc.source.titleIEEE Journal of Selected Topics in Quantum Electronicsen_US
dc.subjectFörster resonance energy transfer (fret)en_US
dc.subjectGreen/yellowen_US
dc.subjectInGaN/GaNen_US
dc.subjectLedsen_US
dc.subjectNanocrystals (ncs)en_US
dc.subjectNonradiative energy transferen_US
dc.titleGreen/yellow solid state lighting via radiative and nonradiative energy transfer involving colloidal semiconductor nanocrystalsen_US
dc.typeArticleen_US

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